In above shown figure, a ball of mass m strike the wall with velocity V and rebounds back with same velocity. Calculate the change in momentum.
2mV directed to the left
mV directed to the left
mV directed to the right
2mV directed to the right
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Initial momentum =mV and after rebound from the wall the final momentum =−mV (negative sign is due to V is opposite to initial V )
So change in momentum =−mV−(mV)=−2mV
The negative sign indicates it is directed to left.
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